Gear-lapping machine



May 12, 1925.

G. C. CARHART GEAR LAPPINGMCHINE Filed March '7, 1923 3 Sheets-Sheet l INVENTOR.

BY I MY/ ATTORN'EIYSU May 1'2, 1925.

G. C. CARHART GEAR LAPPING MCHINE FledMarch '7, 1925 l N VEN TOR.

I Mum.-

. ATTORNEY.

May 12, 1925.

G.- C. CARHART GEAR LAPIING MACHINE Filed March 7; 1923 AINVENTQRQ.

' rack and the latter as crosswlse of the rack.-

Patented May 12, 1925.

UNITED STAT GEoRGE c. caminar,

0F SYRACUSE, NEW YORK, ASSIGNOR T0 BRK)WN-I'JLEEy GEAR CDM/PANY, 0F SYRAQUSE, NEW` YORK, A CQRIIORATION 0F NEW YORK.

GEAR-MAPPING MACHINE Application led March 7, 1923.

To all whom t may concern.'

Be it known that I, GEORGE C. CARHART, a citizen of the United States, residing at Syracuse, in the county of Onondaga and State of New York, have invented a certain newv and usefulY Gear-Lapping Machine, of which the following is a specication.

This invention has for'its object a gear lapping machine, which is particularly simple .1n construction and highly eiiicient and' rapid in operation and by which the (lapping and the' changing of position of the gears is effected by a minimum number of relative movements of the gears and the rack on which they are lapped.

The invention consists in the novel features, and in the combinations and constructions hereinafter set forth and claimed.

In describing thisinvention,|reference is had to ,the accompanying drawings, in which like characters designate corresponding parts in all the views.

Figure l isa plan view of this machine.

Figures 2 and 3 are side and end elevations thereof.

This gear lapping machine comprises a rack and gear carriage for the gear in mesh with the rack and means for eecting relative movement of the rack and the gear carriage in a direction at an inclined angle to the teeth of the -rack and axis of the gear and also preferably a relative movement in a direction atan inclined angle to the teeth of the rack and at an angle to the former relative movement, to roll or change the position or path of the gears relatively to the rack, in `addition. to a rolling movementefected .by any former vrelative movement, so that the gears are rolled by the latter relative movement in addition to the movement about their axis effected by the former relative movement. The former relativemovement is for convenience considered as lengthwise of the The relative movements may be. effected by feeding" the gear carriage along, or .lengthwise of the rack and the gear carriage moved transversely ofthe rack, the

teeth of which are inclined .relatively to the directions of both of said movements; yor by. movingthe rack lengthwise and the serial N6. 623,590.

gear carriage transversely of the rack, the teeth of the rack being inclined relatively to the direction of both movements.

In the illustrated embodiment of my in- Ventron, the rack as shown is movable lengthwise.

l designates the frame, or bed of the machine and saidframe or bed may be of any) suitable form, size and construction, 1t emg supported on legs 2 and formed with horizontal-guides or ways 8. 4 is the rack carriage onwhich the rack 5 is mounted, said carriage being movable along the ways 6 is. the gear carriage movable transversely of the rackl 5, along guides 7 extending 'above'the rack and supported by brackets 8 extending upwardly from opposite sides of the frame.

The teeth of. the rack extend at an inclined or oblique angle relatively to the direction of movement of the rack and vto the transverse movement of the gear carriage. The gear carriage 6 is here illustrated as in the form of frame and is provided with suitable means are mounted, or to receive supports for bearings for the stems of stem gears with the gears in mesh with the rack.

As the teeth oi" the rack 5 are inclined with respect to the direction of movement. of the gear carriage, the Ybearings are arranged to hold the gears with their 'axes inclined relatively to the gear carriage and parallel to the inclination of the teeth of the rack. The movement of the gear car riage transversely of the rack may be continuous or intermittent, and is usually a slow continuous reciprocatin movement.

In operation, the lapping'ls eii'ected lby a relative movement of the rack and gear vcarriage in a direction lengthwise of the a rectangular f f necting rod or necessary Aio yso

L at an inclined angle to The means for actuating the rack 'carriage is here shown as comprising a conpitman'll pivote at one end, at 12 to the rack carriage 4 centrally of the under side thereof and at its other end to a crank or wrist pin 13 on the rotary element or wheel 16 which in turn is connected through suitable mechanism unto describe to a main fdriving shaft 17; and the gear carriage 6 being here shown as movable transversely of the rack carriage 4 by the lever 18. pivoted between its ends' at 19 to a bracket 20 at one side of the frame and connected at one end b a'- linkl 21 to a gear. carriage centrally t ereof and having a oted to its other end, which link is .mounted `on the crank or wrist pin 23 on the rotatable yelementvas a gear 24 connected through suitable power transmitting mechanism, unnecessary to described, to the main drive shaft. The main driveV shaft is connectible to, and disconnectible from, a source of power Ain anyl well-known manner. i l

`In operation, during the lengthwise7 movement` of the rack the lapping operations are performed owing to the inc ined;

rack teeth and during the transverse e movement of the'gear carriage," the posi`-` tion of the gear is changed so that the gear is rolledinto another path `on the rack,

in addition to the motion about their axes effected by the movement of the rack.

What I claim is:

1. In a gear lapping machine, the combi d rack with the gear in lmesh with the rack,

nation of a rack, a gear carriage constructe to rollably mount an unlapped gear in mesh with the rack and means for eifecting relative movement of the rack and the gear carriage in a direction lengthwise of the rack, lthe teeth of the., rack being arrange the direction of suc relative movement substantially as and for the purpose descri d.

2. In a gear lapping machine, nation of a rack, a gear carria the combiconstructe with the' rack, means for eecting relative movement of therack and thegear carriage in a direction lengthwise of the rack, the teeth of the rack being arranged at an inclined angle to the'direction of such. relative movement, and means for effecting relative. movement of the rack and' ear carriage transversely of the rack in a direction atan inclined angle to the rack teeth, substantially as an for the purpose specified,

3. In a gear lapping machine, the combination of a rack, a gear carria e constructed to rollably mount an unlappe ear in mesh with the rack and means fore ecting relative movement of the rack and the gear carringe in two directions at an angle, to each other, the teeth of the rack being arranged link 22 pivh ably d' the direction crosswise o to rollably mount an unlappe gear in mesh of the rack being arrang 'nation of a rack the rack, the rack- 5. In a gear lapping machine, the combi-l a rack thereon,'a

nation of a'rack carriage, gear carriage constructed to rollably mount an unlapped gear in meshl with the rack, one of said carriages being movable in a direction lengthwise of they rack, the rack teeth extending at an inclined angle to such direction of movement and means for actuating the movable carriage, substantially as and for the pur ose described.

. 6. In a gear apping machine, nation of a rack, a gear carria to rollably mount an unlappe with the rack and means or tive movement of the rack and gear carf riage in and at an inclined angle rack, substantially as and for the purpose speciied.

7. In a gear in mesh andmeans for moving the carriage, substantially as and for the purpose set o 8. Inra gear lapping machine, the combination of a rackcarriage having a -rac d thereon, a gear carriage constructed to rollmount an unlapped gear in mesh with the rack, one of said carriages beingpmovable in a direction lengthwise of the rack and one of said carriages l f the rack, the teeth ed at an inclined lengthwise and crosswise movements, and means for .eiectin said relative movements of the carriages su stan: tially as andv for the purpose specified.

9. In a gear lapping machine,

carriage, arack thereon, a to support the gear angle 4to such.

ear carriage arranged direction lengthwise of thea direction -crosswise of the rack` to the teeth of the' the combv being movable in in mesh with the rack, one of said carriages being movab teeth extending at an indirection of movementA clined angle to such being reciprocally,`

and.' the gear carria movable crosswise of t e riages, substantially as and for the purpose described. 010. In a gear le in a direction lengthwise of lapping machine, a frame, a`

rack and means for eiecting the relative movements of thecar.

. rack carriage movable along the frame a rack mountedon the carriage and having teeth inclined relatively to ,the direction of movement of the carriage, guides carried by the frame and extending crossWise of the rack a gear carriage movable along the lastmentioned guides crosswise of the rack for guiding the gear in mesh with the rack, and means for actuating the carriages, substantially as and for the purpose specified.

l1. In a gearlapping machine, a frame formed with guides, a rack carriage movable along the guides, a rack mounted on the carriage and arranged With its teeth eX- tending at an inclined angle to the Idirection of movement of the rack carriage, the frame being also formed with guides arranged above the former guides and extending orosswise of the rack carriage and in a direction at an inclined angle to the teeth of the rack, a gear carriage movable along the last-mentioned guides and arranged to guide a gear in mesh with the rack, and means for actuating the carriages, substantially as and for` the purpose set forth.

In testimony `Whereof, ll have hereunto signed my name, at Syracuse, in the county of Onondaga, and State of NeivYork, this 26th day of February, 1923.l

GEORGE C. CARI-MRT. 

